testing

src/main/java/com/mageddo/dnsproxyserver/server/Starter.java

@@ -30,11 +30,19 @@ public void start() {
       this.startupEvents.forEach(StartupEvent::onStart);
     }
     if (shouldStartDnsServer()) {
-      this.dnsServerStarter.start();
+      this.startDnsServer();
     }
+    this.startWebServer();
+  }
+
+  void startWebServer() {
     this.webServer.start(Configs.getInstance().getWebServerPort());
   }
 
+  void startDnsServer() {
+    this.dnsServerStarter.start();
+  }
+
   private static boolean shouldStartDnsServer() {
     return !isTest() || isMustStartFlagActive();
   }

src/test/java/com/mageddo/dnsproxyserver/server/StarterTest.java

@@ -0,0 +1,47 @@
+package com.mageddo.dnsproxyserver.server;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.Set;
+
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+@ExtendWith(MockitoExtension.class)
+class StarterTest {
+
+  final Starter starter = spy(new Starter(null, null, Set.of()));
+
+  @Test
+  void wontStartInTestMode() {
+
+    doNothing().when(this.starter).startWebServer();
+    doNothing().when(this.starter).startDnsServer();
+
+    this.starter.start();
+
+    verify(this.starter, never()).startDnsServer();
+    verify(this.starter).startWebServer();
+  }
+
+
+  @Test
+  void mustStartWhenInTestModeAndFlagForced() {
+
+    Starter.setMustStartFlagActive(true);
+
+    doNothing().when(this.starter).startWebServer();
+    doNothing().when(this.starter).startDnsServer();
+
+    this.starter.start();
+
+    verify(this.starter).startDnsServer();
+    verify(this.starter).startWebServer();
+
+    Starter.setMustStartFlagActive(false);
+  }
+}